partly backed by investors such as warren buffett. they are putting shares of movies as well as other companies. portugal's public prosecutor has begun investigating the activities. they are independent credit analyst. that investigated the agency's. and he says they favor companies from their own country. the u.s.. >> having a aaa rating gives huge advantages. as we see, it should have been stripped of the aaa status a long time ago. that is a huge difference. the official rating means low borrowing costs and gives the u.s. the huge competitive advantage.